select '123'B is TRUE; 1
SET @a='123';
select '123'is TRUE; 0
select cast('222' as unsigned); 222
select cast('ddd' as unsigned); 0
select cast('2d7dd' as unsigned); 2
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select '123'B is TRUE; 1
SET @a='123';
select '123'is TRUE; 0
select cast('222' as unsigned); 222
select cast('ddd' as unsigned); 0
select cast('2d7dd' as unsigned); 2
相关文章：